telegraf/plugins/aggregators/valuecounter/valuecounter.go

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package valuecounter
import (
"fmt"
"log"
"github.com/influxdata/telegraf"
"github.com/influxdata/telegraf/plugins/aggregators"
)
type aggregate struct {
name string
tags map[string]string
fieldCount map[string]int
}
// ValueCounter an aggregation plugin
type ValueCounter struct {
cache map[uint64]aggregate
Fields []string
}
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// NewValueCounter create a new aggregation plugin which counts the occurrences
// of fields and emits the count.
func NewValueCounter() telegraf.Aggregator {
vc := &ValueCounter{}
vc.Reset()
return vc
}
var sampleConfig = `
## General Aggregator Arguments:
## The period on which to flush & clear the aggregator.
period = "30s"
## If true, the original metric will be dropped by the
## aggregator and will not get sent to the output plugins.
drop_original = false
## The fields for which the values will be counted
fields = []
`
// SampleConfig generates a sample config for the ValueCounter plugin
func (vc *ValueCounter) SampleConfig() string {
return sampleConfig
}
// Description returns the description of the ValueCounter plugin
func (vc *ValueCounter) Description() string {
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return "Count the occurrence of values in fields."
}
// Add is run on every metric which passes the plugin
func (vc *ValueCounter) Add(in telegraf.Metric) {
id := in.HashID()
// Check if the cache already has an entry for this metric, if not create it
if _, ok := vc.cache[id]; !ok {
a := aggregate{
name: in.Name(),
tags: in.Tags(),
fieldCount: make(map[string]int),
}
vc.cache[id] = a
}
// Check if this metric has fields which we need to count, if so increment
// the count.
for fk, fv := range in.Fields() {
for _, cf := range vc.Fields {
if fk == cf {
// Do not process float types to prevent memory from blowing up
switch fv.(type) {
default:
log.Printf("I! Valuecounter: Unsupported field type. " +
"Must be an int, string or bool. Ignoring.")
continue
case uint64, int64, string, bool:
}
fn := fmt.Sprintf("%v_%v", fk, fv)
vc.cache[id].fieldCount[fn]++
}
}
}
}
// Push emits the counters
func (vc *ValueCounter) Push(acc telegraf.Accumulator) {
for _, agg := range vc.cache {
fields := map[string]interface{}{}
for field, count := range agg.fieldCount {
fields[field] = count
}
acc.AddFields(agg.name, fields, agg.tags)
}
}
// Reset the cache, executed after each push
func (vc *ValueCounter) Reset() {
vc.cache = make(map[uint64]aggregate)
}
func init() {
aggregators.Add("valuecounter", func() telegraf.Aggregator {
return NewValueCounter()
})
}